Lubricant Capillary Permeation Modeling and Study of Improved Surface Wettability

doi:10.3901/JME.260829

Abstract

Abstract: Minimum quantity lubrication (MQL) has significant advantages in reducing costs, being environmentally friendly, having a wide range of applications, and improving productivity. It can be applied to various machining methods (turning, milling, grinding, drilling, and micro cutting, etc.) and various materials (plastic materials, hard and brittle materials, high-strength alloys, etc.). However, the effective and rapid penetration of cooling lubricating oil during MQL assisted cutting is a prerequisite for ensuring sufficient cooling and lubrication in the cutting area. Therefore, a capillary permeation model is constructed based on the kinetic analysis of the capillary permeation of cooling lubricant in the cutting area; corresponding geometric models are established for the permeation of droplets and liquid films, and the influence laws of surface wettability and negative pressure in the cutting area on the capillary permeation of water and vegetable oil are analyzed. Based on the simulation analysis, the method of cold plasma modification of workpiece surface wettability is proposed. Simulation and experimental results show that the negative pressure in the cutting area and the wettability of the workpiece surface significantly affect the capillary penetration length and velocity of water and vegetable oil; cold plasma modification can effectively improve the wettability of water and vegetable oil on the workpiece surface. Finally, it is verified by micro-milling aluminum alloy 7050 experiments, and it is found that cold plasma could significantly enhance the cooling and lubrication effect of MQL. The micro-milling force is reduced by 47%-50% and 28%-35% compared with dry and MQL, respectively; and the Sa is reduced by 49%-55% and 22%-27%.

Key words: minimum quantity lubrication, capillary permeation, cold plasma, lubricant, wettability

CLC Number:

TG156

DUAN Zhenjing, WANG Shuaishuai, WANG Ziheng, ZHANG Bingzhen, BIAN Peng, LI Changhe, SONG Jinlong, LIU Xin. Lubricant Capillary Permeation Modeling and Study of Improved Surface Wettability[J]. Journal of Mechanical Engineering, 2026, 62(15): 450-462.

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URL: http://www.cjmenet.com.cn/EN/10.3901/JME.260829

http://www.cjmenet.com.cn/EN/Y2026/V62/I15/450

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